Manage Gnome3 favorites (add, list remove)

gdm-favorites.sh

#!/bin/bash
#
# List / add / remove application favourites to gnome3
# Works with Ubuntu 18.04, 20.04 LTS
#

opt=($*)
favourites="/org/gnome/shell/favorite-apps"

add () {
  local app=$1
  dconf write ${favourites} \
  "$(dconf read ${favourites} | \
  sed "s/, '${app}'//g; s/'${app}'//g" | \
  sed -e "s/]$/, '${app}']/")"
}

list () {
  echo
  dconf read /org/gnome/shell/favorite-apps | \
  sed "s/[][',]\|.desktop/ /g;s/   /\n/g"
}

remove () {
  local app=$1
  dconf write ${favourites} "$(dconf read ${favourites} | \
  sed "s/'${app}', //g; s/, '${app}'//g")"
}

syntax () {
cat << EOFH

 ${0##*/} [option] deskop-file.desktop

   options    add
              list
              remove

EOFH
}

case ${opt[0]} in 
    add) if [ $# -lt 2 ]; then syntax; else add ${opt[1]}; fi ;;
   list) list ;;
 remove) if [ $# -lt 2 ]; then syntax; else remove ${opt[1]}; fi ;;
      *) syntax ;;
esac